Java-马士兵设计模式学习笔记-观察者模式-读取properties文件改成单例模式

一、概述

1.目标：读取properties文件改成单例模式

二、代码

1.Test.java

class WakenUpEvent{
    
    private long time;
    private String location;
    private Child source;
    
    public WakenUpEvent(long time, String location, Child source) {
        super();
        this.time = time;
        this.location = location;
        this.source = source;
    }

    public long getTime() {
        return time;
    }

    public void setTime(long time) {
        this.time = time;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    public Child getSource() {
        return source;
    }

    public void setSource(Child source) {
        this.source = source;
    }
    
    
}

class Child implements Runnable {
    
    private List<WakenUpListener> wakenUpListeners = new ArrayList<WakenUpListener>();
    
    public void addWakenUpListener(WakenUpListener wul){
        wakenUpListeners.add(wul);
    }
    public void wakeUp(){
        for(int i = 0; i < wakenUpListeners.size(); i++){
            WakenUpListener l = wakenUpListeners.get(i);
            l.actionToWakenUp(new WakenUpEvent(System.currentTimeMillis(), "bed", this));
        }
    }

    @Override
    public void run() {
        try {
            Thread.sleep(3000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        wakeUp();
    }
}


interface WakenUpListener {
    public void actionToWakenUp(WakenUpEvent e);
}

class Dad implements WakenUpListener {

    public void actionToWakenUp(WakenUpEvent e) {
        System.out.println("Fedd the child");
    }
    
}

class GrandFather implements WakenUpListener {

    public void actionToWakenUp(WakenUpEvent e) {
        System.out.println("抱孩子");
    }
    
}

class PropertiesMgr{
    
    private static Properties props = new Properties();
    
    //只加载一次，但如果properties有更新，它不会反馈
    static {
        try {
            props.load(Test.class.getClassLoader().getResourceAsStream("com/tong/observer/observer.properties"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getProperty(String key){
        return  props.getProperty(key);
    }
}
public class Test {

    public static void main(String[] args) {
        
        Child c = new Child();
        
        String [] observers = PropertiesMgr.getProperty("observers").split(",");
        
        for(String s : observers){
            try {
                c.addWakenUpListener((WakenUpListener)Class.forName(s).newInstance());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        new Thread(c).start();
    }
}

三、运行结果